Oktyabrskoye
Eastern Transbaikalia, Streltsovsk ore field (Krasnokamensk), Russia
UraniumU (Mo)
- Type
- Hydrothermal uranium veins (pitchblende)
Streltsovsk ore field, linked to a Mesozoic caldera (felsic volcanics and granites), Russia's leading uranium district; spherulitic pitchblende at about 135 ± 3 Ma. Largest internal 238U/235U variation of the study (0.70 ‰ between growth zones of a single crust). 238U/235U ratio measured by Chernyshev et al. (2014): uranium of the early growth zones of pitchblende crusts heavier (by 0.22 to 0.45 ‰) than that of the latest zones, nuclear volume fractionation during reduction of U(VI) to U(IV). Indicative coordinates (Streltsovsk field).
238U/235U isotope ratio, no unit Values of the same system
Standard : NBL CRM 112-A
| Value | Range | n | Mineral or matrix | Source |
|---|---|---|---|---|
| 137.7578 ± 0.0349 | 137.703 / 137.799 | 5 | spherulitic pitchblende crust (312, 220) Mean and standard deviation recalculated from 5 analyses, successive growth zones and whole crust; first zone of 220 at 137.765, last at 137.703; equivalent δ238U -0.97 to -0.28 ‰. | Chernyshev et al. (2014), 238U/235U isotope ratio variations in minerals from hydrotherma… |
| 137.775 ± 0.01 | 1 | jordisite-pitchblende aggregate overgrowing the crust (312) Single analysis; equivalent δ238U -0.45 ‰. | Chernyshev et al. (2014), 238U/235U isotope ratio variations in minerals from hydrotherma… |
Deposits of the same type
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Cite this page
IsoFind Atlas (2026). Oktyabrskoye, isotope signatures. https://www.isofind.tech/isotopes/en/deposits/oktyabrskoye/ (accessed 2026-10-15).
@misc{isofind2026oktyabrskoyeisotopesignatures,
title = {Oktyabrskoye, isotope signatures},
author = {{IsoFind Atlas}},
year = {2026},
url = {https://www.isofind.tech/isotopes/en/deposits/oktyabrskoye/},
note = {Accessed 2026-10-15}
}Updated : 2026-10-15